Patent US3236787A successfully refreshed from Google Patents.
US3236787A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cellular polyurethane prepared from a phosphorus containing polyester
Assignee: Bayer AG
•
Filing: 1961-04-11
•
Granted: 1966-02-22
•
Expires: 1981-04-11
Abstract
No abstract record available.
Inventors
- 👤 Jonas Heinz
- 👤 Hoppe Peter
- 👤 Walaschewski Engelbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 09:07
CPC Classifications
C; C08; C08G; C08G79/00; C08G79/02; C08G79/04; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/42; C08G18/46; C08G18/4684; C08G63/00; C08G63/68; C08G63/692; C08G63/6924
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
52 words
A CELLULAR POLYURETHANE PLASTIC PREPARED BY A PROCESS WHICH COMPRISES REACTING, IN THE PRESENCE OF A BLOWING AGENT, AN ORGANIC POLYISOCYANATE WITH AN HYDROXYL POLYESTER PREPARED BY A PROCESS WHICH COMPRISES REACTING A POLYCARBOXYLIC ACID, A POLYHYDRIC ALCOHOL HAVING 2 TO 6 FREE HYDROXYL GROUPS AND A DIALKYL PHOSPHITE HAVING THE FORMULA
Claim 2
Dependent Claim
52 words
A CELLULAR POLYURETHANE PLASTIC PREPARED BY A PROCESS WHICH COMPRISES REACTING, IN THE PRESENCE OF A BLOWING AGENT, AN ORGANIC POLYISOCYANATE WITH AN HYDROXYL POLYESTER PREPARED BY A PROCESS WHICH COMPRISES REACTING A POLYCARBOXYLIC ACID, A POLYHYDRIC ALCOHOL HAVING 2 TO 6 FREE HYDROXYL GROUPS AND A DIALKYL PHOSPHITE HAVING THE FORMULA
References Cited (Backward Citations)
US2437046A
Cited
US2764565A
Cited
US2913436A
Cited
US2824085A
Cited
US2950262A
Cited
US2926145A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-02-21 | 1969-08-23 | 1970-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-21 | 1973-08-23 | 1974-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-21 | 1977-08-23 | 1978-02-22 | $7700.00 | Window Closed / Lapsed |